#include <stdio.h>

int main ()
{

    int array [10] , sum = 0 ;

    for (int i = 0 ; i < 10 ; i++)
    {

        scanf("%d" , &array [i]) ;

        sum += array [i] ;
        
    }

    printf("%d" , sum / 10) ;

    return 0 ;
    
}